Various fixes to case-dependent code, in order to allow CLASH to work

with Allegro CL in "modern" mode.  Although we don't think that
"modern" mode is the correct approach to case-sensitivity in CL, the
changes we made should also make it easier to work in ANSI-compliant
implementations/modes, with all the settings for readtable-case.  Note
though that this is a first best effort attempt, and so further
case-ification bugs might still remain.  YMMV.

src/package.cl

@@ -6,15 +6,15 @@
 ;;;; Checkout Tag: $Name$
 ;;;; $Id$
 
-(in-package :CL-USER)
+(in-package :cl-user)
 
 ;;;; %File Description:
 ;;;; 
 ;;;; 
 ;;;; 
 
-(defpackage "CLASH"
-    (:use :CL #+(and :CMU :MP) :MP)
+(defpackage :CLASH
+    (:use :cl #+(and :cmu :mp) :mp)
   (:export
    ;; Status Codes
    #:+HTTP-Code-Continue+